Jeep 56029852AA Starter Motor

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Before diagnosing starter problems, make sure the battery is fully charged. If the starter motor does not operate at all when the switch is turned to Start, check that the shift lever is in Neutral or Park (automatic transmission). Ensure that the battery is charged and that all cables, both at the battery and starter solenoid terminals, are clean and secure. If the starter motor spins but the engine is not cranking, the overrunning clutch in the starter motor is slipping and the starter motor needs to be replaced. If the solenoid clicks but the starter motor does not operate, the issue may lie with the battery, starter relay (if equipped), main solenoid contacts, starter motor itself, or a seized engine. If the solenoid plunger cannot be heard when the switch is actuated, it could indicate a bad battery, burned fusible link, or defective solenoid. To check the solenoid, connect a jumper lead between the battery (+) and the ignition switch wire terminal on the solenoid. If the starter motor operates, the solenoid is fine and the problem lies in the ignition switch, neutral start switch, or wiring. If the starter motor still does not operate, remove the starter/solenoid assembly for disassembly, testing, and repair. If the starter motor cranks the engine at a slow speed, ensure the battery is charged and all terminal connections are tight. If the engine is partially seized or has the wrong viscosity oil, it may crank slowly. To test the starter motor, run the engine until normal operating temperature is reached, then disconnect the coil wire from the distributor cap and ground it. Connect a voltmeter positive lead to the positive battery post and the negative lead to the negative post. Crank the engine and take voltmeter readings as soon as a steady figure is indicated, not exceeding 15 seconds of starter motor turning. A reading of 9-volts or more, with normal cranking speed, is normal. If the reading is 9-volts or more but the cranking speed is slow, the motor is faulty. If the reading is less than 9-volts and the cranking speed is slow, the solenoid contacts may be burned, the starter motor is bad, the battery is discharged, or there is a bad connection.

Start by checking the cleanliness and tightness of the battery cable clamps at the battery connection. Inspect the battery cables for any defects and replace them if necessary. Test the battery's condition, and if it fails the tests, replace it with a new one. Examine the starter motor wiring and connections, ensuring the mounting bolts are tight. Check the related fuses in the engine compartment fuse box and inspect the ignition switch circuit. Verify the operation of the clutch pedal position switch or the Transmission Range (TR) sensor, as they provide voltage to the starter solenoid.

To prepare for removing the starter, follow these initial steps: Disconnect the cable from the negative terminal of the battery. Raise the vehicle and ensure it is securely supported on jack stands. Remove the middle engine splash shield. Secure the steering wheel to prevent it from rotating freely.

Begin by disconnecting the cable(s) from the negative battery terminal(s). Raise the vehicle and support it securely on jackstands. On certain models with 4WD and specific transmissions, there may be a support bracket blocking access to the lower starter mounting bolt. If present, remove the support bracket bolts and pry it aside. Remove the heat shield, if equipped, from the starter motor. Next, remove the nut securing the battery cable to the terminal stud on the starter solenoid and disconnect the cable from the terminal stud. Disconnect the electrical connector from the spade terminal on the solenoid. On models with a manual transmission, remove the starter mounting bolt and nut. On models with an automatic transmission, remove the two starter mounting bolts. Move the starter motor towards the front of the vehicle until the nose of the starter pinion housing clears the transmission bellhousing. Tilt the nose down and lower the starter to access the wiring connectors more easily. Finally, disconnect the battery cable and electrical connector from the terminals on the starter motor solenoid and remove the starter. For HEMI engines, follow a similar process, but also remove the two starter motor mounting bolts. For diesel engines, disconnect the wiring harness and battery cable from the starter, remove the three starter mounting bolts, and then remove the starter.

Installation is the reverse of removal.